Pattern-copying machine



May 6, 1930- G. F. RYAN ET AL 1,757,221

PATTERN COPYING MACHINE Filed Oct. 29, 1926 2 sheets-sheet 1 v Figl.

' May 6, 1930. NETAL 1,757,221

PATTERN COPYING MACHINE Filed 001;. 29, 192 2 Sheets-Sheet 2 Patented May 6, 1930 I UNITED ST TES PATENT: were GEORGE FRANCIS RYAN AND ELMER neuron nominee LYNN, MASSACHUSETTS, ASSIGNOBS, BY MESN'E ASSIGNMENTS, '10 UNIT-ED SHOE MACHINERY CORPORATION. or PATERSOL 'NEW JERSEY, A CORPORATION or new JERSEY v PATTERN-COPYING MACHINE Application filed October 29, 1926. Serial No. 145,08 7

This invention relates to pattern copying machines and is disclosed as embodied in a lathe of the type set forthvin U. S. Letters Patent No. 544,891, granted on the application of W. F.Gilman on August 20, 1895, for turning lasts.

A last lathe generally comprises a pendulum-like swing frameiin which the model and work are carried and rotated opposlte a model wheel carriage and a cutter carriage respectively, the carriages being arranged to traverse the model and work from one end to the other. The model rests against the model wheel and the block against the cutter; and the depth of cut is cont-rolled by the relation between the model and model wheel.

As the model and block rotate in theswing and fifty inches long, and is shaped like a rectangular U. If made heavy enough to be really rigid, it jars the machine prejudicially as it swings, and if made light enough to avoid jar it is distorted to such an extent by the model reaction as to prevent good lastcutting.

It, has therefore been found necessary to adopt a compromise design and to run the machine more slowly than the cutter efficiency would warrant, about 15 to 30revolutions per minute, and even then it has proved impracticable entirelyto prevent jarring and distortion of the swing frame which has resulted in irregular reproduction from the model.

A principal object of the present invention is the avoidance of the above described difliculties, and we have found that the provision of a bracing member to support the model against the thrust of the model wheel is perfectly successfulin this regard. Preferably model wheel and travels along the model with it. Advantageously also the wheel is resiliently mounted to permit it to yield under'the irregularities in the model contour, and it has been found additionally advantageous to provide it with. a manually operated control to throw it into operative position and to release it. i i ,V V

I These and other features of the invention comprising certain combinations and arrangements of partswill beapparent from the following description of a preferred embodiment ofthe invention shown in the drawings, in which Fig. 1 is a front elevation of the machine, Fig. 2 is a plan of-the model and the members co-operating with it,-.and Fig. 3 is'an elevation of the parts shown in Fig. 2. i V e u The illustrated machine disclosed is of an ordinary last lathe'type having amain frame 10, a swing frame 12 pivoted at the top of the frame at 14,'model dogs 16 and 18, and work dogs 20and 22 in the swing frame by means ofv which the-model 24; and work 26 can be continuously rotated, and a cutter carriage 28 and a model wheel carriage 30 arranged to slide along the frame. The cutter carriage carries the cutter 32 and the model Wheel carriage carries the model wheel 34 and the width grading mechanism 36. The model wheel and the'cutter carriages may be connected by a width grading-mechanism 38 of any desired character. All of the above mentioned mechanism is well known in the art and needs no further description in view of the fact that it is-fully disclosed in said Letters Patent. 7 Theswing frame carrying the model and the block swings back and forth like a pendulum as the irregularities and contour of the model roll over the model wheel during the rotation of the model; This swinging movement of the swing frame regulates the depth of cut of-the cutter 32 in the block 26 and thus reproduces the model as is well understood. It has proved impracticable to rotate the model and block at a speed of. more than 30 revolutions per minute and even this'speed is reached only on lasts or portions of lasts the contour of which approachesthatof a cylinder. As the model wheelrolls over a high point in the model into a hollow the machine experiences a jar and as the model wheel climbs out of this hollow it experiences another. Under the most favorable conditions this causes roughness in the Work and in general the jar is so severe as to distort the U-shaped swing frame and cause the cutter to out too deep or too high on the block, thus destroying the accuracy of the reproduction. e have'found that a steady ing member applied to the modelopposite the model wheel will "entirely obviate this difficulty. i r

In the disclosed construction this member is a wheel 40 having preferaiblya rubber rim 42 of the hardness and resiliency of the rubber in a solid rubber ball. This wheel is mounted on a bell crank orlever 4E4: pivoted at &6 on the model wheel carriage. The lower arm of the lever is connected by a spring 48 to a treadle'5O mounted on the'fioor or the base of the machine having a ratchet mechanism 52 by means of which it may be locked down. This wheel 40 when in operative position engages the model opposite the model wheel and is resilientlyrand tightly held against itby the spring 48 and this steadies the mechanism and permits the use of a considerably higher speed in rotation. The illustrated machine may be successfully driven at speeds in excess of-50 revolutions per minute whereas the same machine with the wheel 40 removed to inoperative position and with the same model, when run at such speeds knocked the model completely out of the machine.

7 tion.

Having described the invention, what .we claim as new and desire to secure ,by Letters Patent of the United States is:

1. In a pattern copying machine, an oscillating frame arranged to carry and rotate a model, a model wheel carriage, a model wheelon the carriage arranged to contact with a model in the frame, a'lever pivoted on the model wheel carriage, a rotary contact member on the lever arranged to roll on the model oppositethe model Wheel, and a manually operated member constructed and arranged to hold the contact'member against the model, and to release it for removal to inoperative position. 1

' 2. In-a pattern copying machine,- an oscillatingframe arranged'to carry and rotate a 2 model, a model wheelcarriage, a model wheel on the carriage arranged to contact with a model in the frame, a lever pivoted on the model wheel carriage, a rotary contact member on the lever arranged to roll on the model opposite themodel wheel, a treadle, and a spring connecting the treadle with the lever to hold the contact member against the, model.

3. In a pattern c'opyingmachine, an o'scillating frame arranged to .carry 1 and rotate a model, 'a model wheel carriage, a model wheel on the carriage arranged to contact with a model in the frame, a lever pivoted on-the mOdeliW-heel carriage, a rotary contact member'on the lever arranged to roll on the model opposite the model-wheel, a treadle, a spring connecting the treadle with the lever to hold the contact member against the model, and means for locking the treadle in operative position.

In testimony whereof we have signed our names to this specification.

' GEORGE FRANCIS -RYAN.-

VELMER -HUNTON BURKE. 

